FUEL CAP---Help!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BlackBettyGMC · 04-29-2013, 05:52 PM

I have a 1972 GMC with the 402bb. I am in need of the correct fuel cap that is vented.....Unless I'm doing something wrong. I bought a couple from LMC but my tank still has a great deal of pressure build up, not good. Does anyone have or know where I can get an NOS cap that is correct?
Thanks,
James

cdowns · 04-29-2013, 07:19 PM

72 the correct from the factory cap is non vented

the problem is probally // the vent line from the gastank that went up into the passenger side door frame then down into the frame and foward to the charcoal canister to carb// guys disconnect and just plug the lines causing a pressurized tank

if they had common sence and just left the vent line you would have no problem

SS Tim · 04-29-2013, 07:57 PM

If you are having an ongoing problem it does sound like the vent system itself is having a problem.
As you did not tell us what you actually have, 72 GMC covers a lot of metal and variations we are assuming you have a C1500.

Here are the drawings for a 72 chevy which are directly applicable to your truck if it is a C1500.

They are found in the factory service manual section 8.
If you don't have one they can be downloaded here.
http://67-72chevytrucks.com/vboard/s...d.php?t=558016

Remember if you are having a vent problem or smelling fuel it is most likely in the vent system and needs repairs or correction from a hack job improvement.

04-29-2013, 05:52 PM	#1
BlackBettyGMC Registered User Join Date: Jan 2013 Location: Tomball, Texas Posts: 9	FUEL CAP---Help!! I have a 1972 GMC with the 402bb. I am in need of the correct fuel cap that is vented.....Unless I'm doing something wrong. I bought a couple from LMC but my tank still has a great deal of pressure build up, not good. Does anyone have or know where I can get an NOS cap that is correct? Thanks, James

04-29-2013, 07:19 PM	#2
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: FUEL CAP---Help!! 72 the correct from the factory cap is non vented the problem is probally // the vent line from the gastank that went up into the passenger side door frame then down into the frame and foward to the charcoal canister to carb// guys disconnect and just plug the lines causing a pressurized tank if they had common sence and just left the vent line you would have no problem __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

04-29-2013, 07:57 PM	#3
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: FUEL CAP---Help!! If you are having an ongoing problem it does sound like the vent system itself is having a problem. As you did not tell us what you actually have, 72 GMC covers a lot of metal and variations we are assuming you have a C1500. Here are the drawings for a 72 chevy which are directly applicable to your truck if it is a C1500. They are found in the factory service manual section 8. If you don't have one they can be downloaded here. http://67-72chevytrucks.com/vboard/s...d.php?t=558016 Remember if you are having a vent problem or smelling fuel it is most likely in the vent system and needs repairs or correction from a hack job improvement. Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban



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